Monoisotopic mass is now the mass of the isotope of highest abundance and not of lowest mass. This won't change anything for biopolymers, as all the chemical elements used there have their lightest isotope of highest abundance.

Add code to alert the user when a polymer cleavage occurs on a region not encompassing all of its cross-linked monomers.

Fixed small bug within the sequence editor window: the error string would not be erased using the Esc key.

 Update the user manual to document the new feature in the monomer definition dialog (commit dbec7af2).

Implemented new feature in the monomer definition dialog window allowing to compute mass differences between any two monomers.
Make the mono and avg masses of any monomer of which the formula is being displayed/modified.